JP2007142890A - Communication system, base station, mobile station, base station control method, and mobile station control method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a communication system wherein a base station can transmit a command for switching communication ports of a MODEM of a mobile station to the mobile station without controlling a power supply of each communication unit for wireless communication for a particular party and a wireless public line network in order to remotely control data transmission communication medium in the mobile station so that the configuration of the system can be simplified. <P>SOLUTION: In a vehicle management system 10, each mobile station 12 is equipped with a wireless unit 32 for business wireless communication 16 and a mobile phone 33, uses a mobile phone circuit network 17 only when the business wireless communication 16 is not available for data transmission to a base station management center 11 so as to save an imposed charge of the mobile phone circuit network 17. In this case, the base station management center 11 discriminates which of the business wireless communication 16 and the mobile phone circuit network 17 each mobile station uses on the basis of GPS data from the mobile station 12. When the switching is required, the base station management center 11 transmits a control command for switching the communication ports of the MODEM 30 to the mobile station 12. Further, the mobile station 12 switches the communication port of the MODEM 30 to a position of the wireless unit 32 or a position of the mobile phone 33 on the basis of the control command from the base station management center 11. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a communication system, a base station, a mobile station, a base station control method, and a mobile station control method that are applied to, for example, bus operation management and vehicle dispatch management such as taxis.

Patent Document 1 relates to communication between a management center as a base station and a vehicle as a mobile station, and each vehicle is equipped with a communication device for business wireless communication and a mobile phone network (paragraph of Patent Document 1). 0009), information related to the power state of each communication device is sent to the management center (paragraphs 0009 to 0011 of Patent Document 1), and the management center sends a command to remotely control the power supply of each communication device in each vehicle (patent Paragraph 0024) of Literature 1 discloses that each vehicle switches the power supply of the communication device based on a remote control command from the management center.
JP 2003-217094 A

  The problems of the vehicle management system of Patent Document 1 are as follows.

Hardware for controlling the power supply of the commercial wireless communication device and the power supply of the mobile phone network communication device (referred to as “in-vehicle terminal” in Patent Document 1; reference numeral 3 in FIG. 3 of Patent Document 1) Necessary.

・ Turn on the wireless communication device for business use and the communication device for mobile phone network network to turn on / off the business wireless communication and mobile phone network network. It takes time to transition between wireless communication and mobile phone network.

-The power supply circuit for commercial wireless communication equipment and the power supply circuit for mobile phone network communication equipment require hardware to be turned on and off by control signals from the in-vehicle terminal, whereas standard power supply The equipment is not equipped with such hardware. Therefore, it is difficult to use a standard communication device power supply as it is.

-The management center needs to obtain information on the status of each power source from each vehicle in order to remotely control each power source of the commercial radio communication device and the mobile phone network communication device in each mobile station. Each mobile station needs to monitor the current power status of each communication device of its own and report it to the management center one by one.

  An object of the present invention is to provide a communication system, a base station, a mobile station, a base station control method, and a mobile station control method that overcome the above problems.

  The communication system of the present invention includes a base station and a plurality of mobile stations, and the base station and each mobile station can communicate with each other by a communication medium of a specific person wireless communication and a wireless public line network.

The base station of the present invention has the following.
Data receiving means for receiving at least data relating to current location information from each mobile station;
Communication medium designating means for designating from among specific person wireless communication and wireless public network based on the current location information of each mobile station using the communication medium used by each mobile station as the designated communication medium, and data in the modem of each mobile station Command transmission means for transmitting a communication medium control command to each mobile station so that the transmission communication port is on the designated communication medium side.

The mobile station of the present invention has the following.
Command receiving means for receiving a communication medium control command from the base station;
Based on the communication medium control command from the base station for the modem equipped with each communication port on the wireless communication side for the specific person and the wireless public network side as a communication port that can be used for data transmission. Communication medium control means for controlling, and data transmission means for transmitting at least data related to current location information to the base station via a data transmission communication port.

The base station control method of the present invention has the following steps.
In a base station control method in a communication system including a base station and a plurality of mobile stations, wherein the base station and each mobile station can communicate with each other by a communication medium of a specific person wireless communication and a wireless public network ,
Receiving at least data relating to current location information from each mobile station;
Designating a communication medium to be used by each mobile station as a designated communication medium from a wireless communication for a specific person and a wireless public line network based on the current location information of each mobile station;
Transmitting a communication medium control command to each mobile station so that the data transmission communication port in the modem of each mobile station is on the designated communication medium side;

The mobile station control method of the present invention has the following steps.
In a mobile station control method in a communication system, including a base station and a plurality of mobile stations, wherein the base station and each mobile station can communicate with each other by a communication medium of a specific person wireless communication and a wireless public network ,
Receiving a communication medium control command from the base station;
Based on the communication medium control command from the base station for the modem equipped with each communication port on the wireless communication side for the specific person and the wireless public network side as a communication port that can be used for data transmission. Step to control,
Transmitting at least data related to current location information to the base station via the data transmission communication port;

  According to the present invention, in order to remotely control the data transmission communication medium in the mobile station, the base station uses the modem of the mobile station instead of the power supply of each communication device of the specific person wireless communication and the wireless public network. Since it is sufficient to transmit a command for switching the communication port to the mobile station, the configuration of the communication system can be simplified.

  FIG. 1 is a configuration diagram of the vehicle management system 10. The vehicle management system 10 includes a single base station management center 11 and a plurality of mobile stations 12. The base station management center 11 and the mobile station 12 can freely transmit and receive data via the business wireless communication 16 and the mobile phone network 17. While the area of the commercial wireless communication 16 is limited, the typical service area of the mobile phone network 17 includes the area of the commercial wireless communication 16 on the inner side and is a vast area covering almost the whole country. It has become a thing. The cellular phone network 17 is used, for example, for an e-mode of NTT Docomo and a mail line in a cellular phone or the like.

  The vehicle management system 10 is applied to vehicle allocation management (taxi, truck, etc.) or operation management (route bus, etc.) of a moving body in a relatively small area or city. A vehicle allocation / operation management system using a mobile phone equipped with a GPS receiver, which is widely used nowadays, is not optimal from the user's point of view because it is necessary to bear a large amount of packet fee as an operation cost every month. In the vehicle management system 10, it is preferable to maximize the use area of the commercial wireless communication 16 in order to minimize the operation cost. Therefore, the base station management center 11 is installed, for example, in a garage where the operation starts or a point close to the center of the area or city. The business wireless communication 16 that does not incur operating costs is used as much as possible, and the mobile phone network 17 is used only in areas where the business wireless communication 16 cannot communicate. However, when an emergency such as a bus jack occurs, even if the mobile station 12 is within the communication area of the business wireless communication 16, both the business wireless communication 16 and the mobile phone network 17 are used. The base station management center 11 is notified of the emergency including the GPS information of the mobile station 12.

  The base station management center 11 includes a management server 20, a display 21, a transmission modem 22, a reception modem 23, a hub 24, a transmission radio 25, a reception radio 26, and a router 27. The display 21 can display the current position of each mobile station 12 on a map as appropriate. The management server 20 includes a plurality of I / O ports, and a transmission modem 22, a reception modem 23, and a hub 24 are connected to each I / O port.

  When the base station management center 11 transmits data to the mobile station 12 using the business wireless communication 16, the digital data from the management server 20 is code-converted and modulated by the transmission modem 22, and transmitted. It is transmitted from the trusted wireless device 25 by the business wireless communication 16. The signal received by the reception wireless device 26 by the business wireless communication 16 is demodulated and code-converted by the reception modem 23 and then sent to the management server 20.

  When the base station management center 11 transmits data to the mobile station 12 using the mobile phone network 17, the digital data from the management server 20 is sent to the router 27 via the hub 24, and The data is sent from the router 27 to the cellular phone network 17.

  Each mobile station 12 includes a modem 30, a GPS receiver 31, a radio device 32, a mobile phone 33, and an emergency switch 34. The modem 30 is equipped with a communication port for data transmission individually for the modem 30, the radio device 32, the mobile phone 33 and the emergency switch 34. The modem 30 also has a function of making each communication port individually in use or not in use.

  The GPS receiver 31 measures the current location based on satellite radio waves from a plurality of GPS satellites, and outputs it to the modem 30 as GPS data (data representing the current location in longitude and latitude). The modem 30 has a function of converting between analog and digital, and converts the GPS data from the GPS receiver 31 to the communication port on the wireless device 32 side after analog conversion, or to the mobile phone 33 after packetizing it as digital data. Output to the communication port.

  When the mobile station 12 transmits data to the base station management center 11 using the business radio communication 16, the modem 30 uses the communication port on the radio device 32 side for data transmission to the base station management center 11. Select as port. As a result, the signal modulated in the modem 30 is transmitted from the wireless device 32 by the business wireless communication 16. The business wireless communication 16 is directly received by the reception wireless device 26 of the base station management center 11.

  When the mobile station 12 transmits data to the base station management center 11 using the mobile phone network 17, the modem 30 uses the communication port on the mobile phone 33 side for data transmission to the base station management center 11. Select as port. As a result, the signal modulated in the modem 30 is wirelessly transmitted to a nearby fixed station of the mobile phone network 17 and then reaches the router 27 of the base station management center 11 via the fixed station. To do.

  The mobile station 12 is supplied with power from the battery of the vehicle in which it is mounted. The mobile station 12 is equipped with a switch (not shown) that interlocks with starting and stopping of the engine of the vehicle. The switch is in an off position when the engine is stopped, stops power supply from the battery to the mobile station 12, and is turned on only during operation of the engine to supply power from the battery to the mobile station 12. .

  When the vehicle carrying the mobile station 12 exits the garage to start operation, the engine is started, and the mobile station 12 is supplied with power from the battery and is in an operating state. Since the vicinity of the garage is naturally within the area of the commercial wireless communication 16, in the vehicle management system 10, the modem 30 of the mobile station 12 transmits data to the base station management center 11 via the wireless device 32 side communication port. Send. The mobile station 12 prepares a mobile station side flag for itself, and the base station management center 11 prepares each base station side flag in association with each mobile station 12. When the mobile station 12 leaves, the mobile station side flag of the mobile station 12 is reset, and the base station side flag associated with the mobile station 12 in the base station management center 11 is also reset. ,

  When the mobile station 12 stays in the area of the business wireless communication 16 after the vehicle has left, the management server 20 appropriately sends a polling command Pc to the modem 30 of the mobile station 12 via the business wireless communication 16. Send. When the modem 30 of the mobile station 12 receives the polling command Pc via the wireless device 32 side communication port, the modem 30 transmits response data Pr via the wireless device 32 side communication port. The Pr includes GPS data related to the current location of the mobile station 12 by the GPS receiver 31. The modem 30 is not to output GPS data and other data to the mobile phone 33 side communication port until the modem 30 receives a switching command Cs from the base station management center 11 to the mobile phone 33 side communication port.

  The management server 20 of the base station management center 11 grasps the current location of the mobile station 12 based on the GPS data from the mobile station 12 and determines whether the current location is within the area of the business wireless communication 16 or outside the area. When the management server 20 determines that the current location is within the area of the commercial wireless communication 16, the management server 20 resets the base station side flag associated with the mobile station 12 that is the transmission source of the current location, When it is determined that the base station side flag is set, the base station side flag is set.

  When the base station management center 11 determines that the mobile station 12 has moved out of the area of the commercial wireless communication 16, the management server 20 connects the modem 30 of the mobile station 12 to the line via the mobile phone network 17. After the connection, the mobile phone communication start command Cs is transmitted to the modem 30. When the modem 30 receives the mobile phone communication start command Cs after receiving from the management server 20 via the mobile phone network 17, it returns an acknowledgment As via the mobile phone network 17 and sets the mobile station side flag. set. The mobile station side flag is stored in the nonvolatile memory of the mobile station 12. Thereafter, the modem 30 sets the communication port on the mobile phone 33 side as a communication port for data transmission, transmits GPS data to the management server 20 via the mobile phone network 17, and transmits GPS data to the communication port on the radio device 32 side. Is transmitted while waiting for a switching command from the management server 20.

  On the other hand, the management server 20 waits for an acknowledgment As from the modem 30 in response to the mobile phone communication start command Cs transmitted to the mobile station 12 through the mobile phone network 17. When the confirmation response As is received, the base station side flag associated with the mobile station 12 that is the transmission source of the As is set and stored in the storage device. When the management server 20 does not receive the confirmation response As within a predetermined time despite the transmission of the mobile phone communication start command Cs to the modem 30, the management server 20 receives the confirmation response As every time the predetermined time elapses. A mobile phone communication start command Cs is transmitted to the modem 30. This is because the mobile station 12 may temporarily enter a dead zone of the mobile phone network 17 such as in a tunnel or behind a building and cannot receive the mobile phone communication start command Cs.

  When the mobile station 12 stays in the area of the mobile phone network 17 outside the area of the business radio communication 16, the modem 30 does not receive the polling command Pc from the management server 20 and uses the mobile phone network 17. The GPS data is appropriately transmitted to the management server 20 through the network. As a result, the polling command Pc from the management server 20 to the modem 30 is omitted, and billing associated with the use of the cellular phone network 17 can be saved. The appropriate transmission from the modem 30 to the management server 20 via the mobile phone network 17 is, for example, transmission at regular time intervals or transmission every time the mobile station 12 moves a predetermined distance. Further, the management server 20 can include information related to designation of the transmission time interval of GPS data from the modem 30 to the management server 20 in the polling command Pc sent to the modem 30.

  When the base station management center 11 determines that the mobile station 12 has moved from outside the area of the commercial wireless communication 16 into the area, the management server 20 sends a cellular phone communication end command Ce via the cellular phone network 17 to the modem. 30. When the modem 30 receives the cellular phone communication end command Ce, the modem 30 returns an acknowledgment Ae via the cellular phone network 17 and resets the mobile station side flag. The mobile station side flag is stored in the nonvolatile memory of the mobile station 12. Thereafter, the modem 30 transmits the GPS data to the management server 20 via the business wireless communication 16 side communication port, and a switch command from the management server 20 for transmission of the GPS data to the mobile phone 33 side communication port. Wait in a wait state.

  On the other hand, the management server 20 waits for an acknowledgment Ae from the modem 30 in response to the mobile phone communication end command Ce transmitted to the modem 30 via the mobile phone network 17. When the confirmation response Ae is received, the base station side flag associated with the mobile station 12 that is the transmission source of the Ae is reset and stored in the storage device. If the management server 20 does not receive the confirmation response Ae within a predetermined time despite the transmission of the mobile phone communication end command Ce to the modem 30, the management server 20 will receive the confirmation response Ae every time the predetermined time elapses. A mobile phone communication start command Cs is transmitted to the modem 30.

  The vehicle on which the mobile station 12 is mounted may be temporarily turned off due to a driver's break or the like, and the mobile station 12 may be turned off together with other on-vehicle devices to be in an inoperative state. is there. Thereafter, as the operation is resumed, the engine of the vehicle is started, and the mobile station 12 is again supplied with power and resumes operation. When the operation is resumed, the modem 30 refers to the value of the mobile station side flag, and if the mobile station side flag is set, the mobile phone 33 side communication port is used as the data transmission communication port, If the mobile station side flag is in a reset state, GPS data is transmitted to the management server 20 using the radio 32 side communication port as a data transmission communication port.

  The occurrence of an emergency in a vehicle equipped with the mobile station 12 is detected by, for example, a driver, a passenger, or the like operating an emergency switch installed at a predetermined location in the vehicle. When an emergency situation occurs, the modem 30 of the mobile station 12 uses both the business wireless communication 16 side communication port and the mobile phone network 17 side communication port as data transmission communication ports, and transmits an emergency notification signal and GPS. Data is repeatedly transmitted to the base station management center 11. If the mobile station 12 is outside the area of the business radio communication 16, even if the modem 30 sends an emergency notification signal or GPS data to the radio 32 side communication port, they are still in the business radio communication The emergency notification signal and the GPS data reach the base station management center 11 from the mobile phone 33 side communication port via the mobile phone network 17 without reaching the base station management center 11 via 16. However, as soon as the mobile station 12 enters the area of the commercial wireless communication 16, data between the mobile station 12 and the base station management center 11 via both the commercial wireless communication 16 and the mobile phone network 17. Sending and receiving is possible.

  At the time of occurrence of an emergency situation, if the line of the mobile phone network 17 is not connected between the base station management center 11 and the mobile station 12, the modem 30 connects the mobile phone network 17 to the management server 20. Connect the line. The modem 30 continues to report the emergency to the base station management center 11 until it receives a polling command for canceling the emergency notification signal from the management server 20 via the mobile phone network 17. After receiving the polling command for canceling the emergency notification signal, the modem 30 receives the mobile phone communication start command Cs or the mobile phone communication end command Ce from the base station management center 11, and then the radio device 32 side and the mobile phone 33 side. One of the communication ports is used as a data transmission communication port.

  FIG. 2 is a diagram showing the relationship between the boundary line 41 and the switching area 42 of the business wireless communication area 40. The business wireless communication area 40 is created and recorded based on a preliminary survey as GPS data (latitude / mild position information) within a predetermined range. Therefore, if the GPS data (current location information) of the mobile station 12 is given, it is determined in principle whether the current location of the mobile station 12 is in the business wireless communication area 40 or outside the business wireless communication area 40. it can. However, the boundary line 41 of the commercial wireless communication area 40 is a complex line, and each time GPS data is received from the mobile station 12, it is calculated whether the GPS data is inside or outside the boundary line 41. The calculation amount is enormous and real-time processing is difficult.

  Therefore, in order to enable real-time calculation, a predetermined switching area 42 is set inside the boundary line 41. The switching area 42 is composed of a set of simple figures that can easily calculate whether the area is inside or outside the area, and circulates on the inner circumference side of the boundary line 41. The figure is, for example, a square area 43 having the same size. Each square area 43 is as close as possible to the boundary line 41 from the inner peripheral side, and adjacent sides at least partially overlap the sides.

  For convenience of explanation, in FIG. 2, the square area 43 is drawn larger than the actual area. For example, if the management server 20 determines from the GPS data received from the mobile station 12 that the current location of the mobile station 12 exists in any square area 43, the management server 20 sends Cs to the mobile station 12. If the management server 20 determines from the GPS data successively received from the mobile station 12 that the current location of the mobile station 12 has moved from the switching area 42 to a point on the inner circumference side, the management server 20 sends the Ce to the mobile station 12. Send.

  Each square area 43 is divided into two parts, a rectangular part on the inner peripheral side and a rectangular part on the outer peripheral side. When the current location of the mobile station 12 is in the rectangular part on the outer peripheral side, the base station management center 11 When Cs is transmitted to 12 and the current location of the mobile station 12 is in the rectangular portion on the inner circumference side, Ce may be transmitted from the base station management center 11 to the mobile station 12.

  FIG. 3 is a configuration diagram of the communication system 50. The communication system 50 includes a base station 51 and a plurality of mobile stations 52. The base station 51 and each mobile station 52 can communicate with each other by the communication medium of the specific person wireless communication 55 and the wireless public line network 56. An example of the communication system 50 is the vehicle management system 10 (FIG. 1), and examples of the base station 51 and the mobile station 52 are the base station management center 11 and the mobile station 12, respectively. An example of the specific person wireless communication 55 and the wireless public network 56 is the business wireless communication 16 and the mobile phone network 17, respectively.

  FIG. 4 is a block diagram of the base station 51. The base station 51 has data receiving means 60, communication medium specifying means 61, and command transmitting means 62. Since the confirmation reception means 67 and the first flag control means 68 are added as an embodiment of the base station 51, only the data reception means 60, the communication medium designation means 61 and the command transmission means 62 will be described later. To do.

  The data receiving means 60 receives at least data related to current location information from each mobile station 52. The communication medium designating means 61 designates the designated person wireless communication 55 and the wireless public line network 56 based on the current location information of each mobile station 52 using the communication medium to be used by each mobile station 52 as the designated communication medium. The command transmission means 62 transmits a communication medium control command to each mobile station 52 so that the data transmission communication port in the modem of each mobile station 52 is on the designated communication medium side.

  The data relating to the current location information is, for example, GPS data. The base station 51 transmits to the mobile station 52 a communication medium control command that designates a data transmission communication port in the modem of the mobile station 52.

  FIG. 5 is a block diagram of the mobile station 52. The mobile station 52 includes command receiving means 75, communication medium control means 76, and data transmission means 77. Since the response means 81 and the operation detection means 83 are added as an embodiment of the mobile station 52, only the command reception means 75, the communication medium control means 76, and the data transmission means 77 will be described later.

  The command receiving means 75 receives a communication medium control command from the base station 51. The communication medium control unit 76 sets the data transmission communication port as a base for a modem equipped with each communication port on the specific person wireless communication 55 side and the wireless public line network 56 side as a communication port usable for data transmission. Control is performed based on a communication medium control command from the station 51. The data transmission unit 77 transmits at least data related to the current location information to the base station 51 via the data transmission communication port.

  The mobile station 52 controls the data transmission communication port based on a communication medium control command from the base station 51, and the control command is used for each communication device of the specific person wireless communication 55 and the wireless public line network 56. This is not related to the power supply control of the modem but to the control of the communication port of the modem. As a result, it is possible to omit adding a switch that is turned on / off by a control signal to the power supply circuit of the communication device or adding hardware that outputs an on / off control signal to the power supply circuit of the communication device. Switching the communication port in the modem can be achieved by only a software change or only a minimal hardware change.

  Hereinafter, preferred embodiments of the base station 51 and the mobile station 52 will be described.

  As a communication medium control command, a first command for switching the data transmission communication port in the modem of the mobile station 52 from the specific person wireless communication 55 side to the wireless public line network 56 side, and the modem communication port as a wireless public line A second command for switching from the network 56 side to the specific person wireless communication 55 side is determined. The command transmission means 62 of the base station 51 transmits the first and second commands to the mobile station 52 via the wireless public line network 56 as the use start instruction and the use end instruction of the wireless public line network 56, respectively. To do.

  A typical service area of the wireless public line network 56 includes an area of the wireless communication 55 for specific person inside, and the first and second commands are transmitted to the mobile station 52 via the wireless public line network 56. By being transmitted to, the reception failure of the command in the mobile station 52 is surely prevented.

  The base station 51 can further include a confirmation receiving unit 67 and a first flag control unit 68 (FIG. 4). The confirmation receiving unit 67 receives confirmation responses to the first and second commands to the mobile station 52. The first flag control means 68 controls the first flag based on the confirmation response from the mobile station 52. The command transmission means 62 determines whether or not the data transmission communication port in the modem of each mobile station 52 is on the designated communication medium side based on the first flag, and first determines to each mobile station 52 based on the determination result. Alternatively, the second command is transmitted.

  The first flag is a base station side flag in the base station management center 11, for example. The base station 51 can know the data transmission communication port in the mobile station 52 with reference to the first flag, and can transmit the first or second command based on this.

  The mobile station 52 can further include response means 81. The response unit 81 returns a confirmation response to the base station 51 in response to the first and second commands from the base station 51, and controls the second flag based on the first and second commands from the base station 51. And stored in a non-volatile memory. The communication medium control means 76 controls the data transmission communication port based on the second flag read from the nonvolatile memory at the next re-on after the mobile station 52 is turned off.

  The second flag is, for example, a mobile station side flag. The mobile station 52 is turned off and put into a non-operational state for a temporary break of a driver or the like or for the end of work. The mobile station 52 can make the data transmission communication port before resuming operation the data transmission communication port after resuming operation by referring to the second flag when the operation is resumed thereafter.

  The command transmission means 62 of the base station 51 includes a command regarding the transmission time interval of the current location information to the base station 51 in the first command. The data transmission means 77 of the mobile station 52 transmits the data related to the current location information at the transmission time interval in the first command during the period in which the wireless public network 56 side communication port is used as the data transmission communication port. Automatic transmission to 51.

  Even after transmitting the first command once, the base station 51 can appropriately retransmit the first command and change the transmission time interval of the current location information to the base station 51.

  The mobile station 52 performs polling by independently transmitting data related to the current location information to the base station 51 via the wireless public line network 56 without receiving polling of the current location information transmission command from the base station 51 one by one. The charging fee imposed on can be reduced.

  A plurality of quadrangular areas having the same dimensions and the same shape circulate along the boundary line on the inner peripheral side of the boundary line of the wireless communication for specific person 55, and at least adjacent sides in the circumferential direction. Are set so as to partially overlap each other. If the point related to the current location information of the mobile station 52 is a point in any square area of the circuit train, the command transmission means 62 of the base station 51 sends a command to start using the wireless public network 56 as a communication medium control command. Send as. In addition, if the point related to the current location information of the mobile station 52 moves from within any square area of the loop train to a point on the base station side from the loop train, a use end command of the wireless public network is used as a communication medium control command. Send.

  The square area is typically the square area 43 in FIG. 2, but may be a rectangular area or a parallelogram area. For example, it is possible to easily determine whether or not the current location is within the rectangular area by comparing the coordinates of each vertex of the rectangular area with the coordinates of the current location.

  Each mobile station 52 can also have an operation detection means 83. The operation detection means 83 detects the operation of the emergency switch. When the emergency switch is operated, the data transmission unit 77 sets both the specific-person wireless communication 55 side communication port and the wireless public line network 56 side communication port as data transmission communication ports.

  When an emergency occurs, it is desirable to share the specific person wireless communication 55 and the wireless public line network 56 for communication from the base station 51 to the mobile station 52. In this way, it is possible to improve the guarantee of communication between the base station 51 and the mobile station 52 when an emergency occurs in the mobile station 52.

  FIG. 6 is a flowchart of the base station control method 90. The base station control method 90 is applied to the base station 51 (FIG. 4) of the communication system 50. The base station control method 90 includes S91, S92, and S93.

  In S91, at least data relating to the current location information is received from each mobile station 52. In S92, the communication medium to be used by each mobile station 52 is designated as the designated communication medium from the specific person wireless communication 55 and the wireless public line network 56 based on the current location information of each mobile station 52. In S93, a communication medium control command is transmitted to each mobile station 52 so that the data transmission communication port in the modem of each mobile station 52 is on the designated communication medium side.

  FIG. 7 is a flowchart of the mobile station control method 100. The mobile station control method 100 is applied to the mobile station 52 (FIG. 4) of the communication system 50. The mobile station control method 100 includes S101, S102, and S103.

  In S101, a communication medium control command is received from the base station 51. In S102, a communication port for data transmission is sent from the base station 51 to a modem equipped with each communication port on the wireless communication network for specific person 55 side and the wireless public network 56 side as a communication port that can be used for data transmission. Control based on communication medium control command. In S103, at least the data related to the current location information is transmitted to the base station 51 via the data transmission communication port.

  Hereinafter, preferred embodiments of the base station control method 90 and the mobile station control method 100 will be described.

  As a communication medium control command, a first command for switching a data transmission communication port in a modem from a specified person wireless communication side to a wireless public line network side, and a modem communication port from the wireless public line network side to a specified person A second command for switching to the wireless communication side is determined. In S94 of the base station control method 90, the first and second commands are both transmitted to the mobile station 52 via the wireless public network as a wireless public network usage start command and usage termination command, respectively.

  In the base station control method 90, the following steps U10 and U11 (not shown) can be appropriately added before S94. In U10, confirmation responses to the first and second instructions to the mobile station 52 are received. In U11, the first flag is controlled based on the confirmation response from the mobile station 52. In S94, it is determined based on the first flag whether or not the data transmission communication port in the modem of each mobile station 52 is on the designated communication medium side, and the first or Send a second command.

  In the mobile station control method 100, the next step U15 (not shown) can be appropriately added before S102. In U15, an acknowledgment response is returned to the base station 51 in response to the first and second commands from the base station 51, and the second flag is controlled based on the first and second commands from the base station 51. And it stores in the non-volatile memory. In S102, the data transmission communication port is controlled based on the second flag read from the nonvolatile memory at the next re-on after the mobile station 52 is turned off.

  In S95 of the base station control method 90 and S103 of the mobile station control method 100, processing can be added as follows. That is, in S95. The first command includes a command for the transmission time interval of the current location information to the base station 51. In S103, during the period in which the wireless public network side communication port is used as the data transmission communication port, the data related to the current location information is automatically transmitted to the base station 51 at the transmission time interval in the first command.

  S92 of the base station control method 90 can be embodied as follows. A plurality of quadrangular areas having the same dimensions and the same shape circulate along the boundary line on the inner periphery side of the boundary line of the wireless communication area for specific person, and at least on the adjacent side in the circulation direction. Set so that they partially overlap. In S92, if the point related to the current location information of the mobile station 52 is a point in any square area of the circuit train, a use start command for the wireless public network 56 is transmitted as a communication medium control command. Also, if the point related to the current location information of the mobile station 52 moves from within any square area of the circuit train to a point on the base station side from the circuit train, a command to start using the wireless public network 56 is sent as a communication medium control command. Send as.

  The mobile station control method 100 can add S18 (not shown) and change S102 as follows. That is, in U18, the operation of the emergency switch is detected. In S102, when the emergency switch is operated, both the wireless communication side communication port for the specific person and the communication port on the wireless public line network side are set as communication ports for data transmission.

  Although the present invention has been described with respect to the best mode, it is needless to say that the present invention is not limited to this and can be implemented in various forms within the scope of the gist.

It is a block diagram of a vehicle management system. It is a figure which shows the relationship between the boundary line of a business use wireless communication area, and a switching area. It is a block diagram of a communication system. It is a block diagram of a base station. It is a block diagram of a mobile station. It is a flowchart of a base station control method. It is a flowchart of a mobile station control method.

Explanation of symbols

50: communication system, 51: base station, 52: mobile station, 55: wireless communication for specific person, 56: wireless public network, 60: data receiving means, 61: communication medium designating means, 62: command transmitting means, 67: confirmation reception means, 68: first flag control means, 75: command reception means, 76: communication medium control means, 77: data transmission means, 81: response means, 83: operation detection means, 100: control method.

Claims (11)

A communication system including a base station and a plurality of mobile stations, wherein the base station and each mobile station can communicate with each other by a communication medium of wireless communication for a specific person and a wireless public network,
The base station
Data receiving means for receiving at least data relating to current location information from each mobile station;
Communication medium designating means for designating from among specific person wireless communication and wireless public network based on the current location information of each mobile station using the communication medium used by each mobile station as the designated communication medium, and data in the modem of each mobile station Command transmission means for transmitting a communication medium control command to each mobile station so that the communication port for transmission is on the designated communication medium side;
Have
Each mobile station
Command receiving means for receiving a communication medium control command from the base station,
As a communication port that can be used for data transmission, for a modem equipped with each communication port on the specific person wireless communication side and wireless public network side, the data transmission communication port is used as a communication medium control command from the base station. Communication medium control means for controlling based on data transmission means for transmitting at least data relating to current location information to the base station via a data transmission communication port;
The communication system characterized by having. As the communication medium control command, a first command for switching the data transmission communication port in the modem from the wireless communication side for the specified person to the wireless public network side, and the communication port of the modem from the wireless public network side A second command for switching to the specific person wireless communication side is determined,
The command transmission means of the base station transmits both the first and second commands as a use start command and a use end command of the wireless public line network to the mobile station through the wireless public line network, respectively. The communication system according to claim 1. The base station
Confirmation receiving means for receiving confirmation responses to the first and second commands to the mobile station;
First flag control means for controlling a first flag based on an acknowledgment from the mobile station, and whether or not the data transmission communication port in the modem of each mobile station is on the designated communication medium side Command transmitting means for determining based on the flag and transmitting the first or second command to each mobile station based on the determination result;
The communication system according to claim 2, further comprising: Each mobile station
A confirmation response is returned to the base station in response to the first and second instructions from the base station, and a second flag is controlled based on the first and second instructions from the base station, and a non-volatile memory And a communication medium control means for controlling the data transmission communication port based on the second flag read from the non-volatile memory at the next power-on after the mobile station is turned off. ,
The communication system according to claim 2 or 3, characterized by comprising: The command transmission means of the base station includes a command about a transmission time interval of the current location information to the base station in the first command,
The data transmission means of the mobile station transmits data related to current location information at a transmission time interval in a first command during a period in which a wireless public network side communication port is used as a data transmission communication port. The communication system according to any one of claims 2 to 4, wherein the communication system is automatically transmitted. A plurality of quadrangular areas having the same dimensions and the same shape circulate along the boundary line on the inner periphery side of the boundary line of the wireless communication area for specific person, and at least on the adjacent side in the circulation direction. Set to partially overlap,
If the point related to the current location information of the mobile station is a point in any square area of the lap train, the command transmission means of the base station is a wireless public line network. If the point related to the current location information of the mobile station moves from within any square area of the circulating train to the point on the base station side from the circulating train, The communication system according to any one of claims 1 to 4, wherein a command to end use of a wireless public network is transmitted as a communication medium control command. Each mobile station
An operation detecting means for detecting an operation of an emergency switch, and the communication which, when the emergency switch is operated, makes both the radio communication side communication port for a specific person and the communication port for the wireless public network side a data transmission communication port. Medium control means,
The communication system according to claim 1, comprising: Data receiving means for receiving at least data relating to current location information from each mobile station;
Communication medium designating means for designating from among specific person wireless communication and wireless public network based on the current location information of each mobile station using the communication medium used by each mobile station as the designated communication medium, and data in the modem of each mobile station Command transmission means for transmitting a communication medium control command to each mobile station so that the communication port for transmission is on the designated communication medium side;
A base station characterized by comprising: Command receiving means for receiving a communication medium control command from the base station;
As a communication port that can be used for data transmission, for a modem equipped with each communication port on the specific person wireless communication side and wireless public network side, the data transmission communication port is used as a communication medium control command from the base station. Communication medium control means for controlling based on data transmission means for transmitting at least data relating to current location information to the base station via a data transmission communication port;
A mobile station characterized by comprising: In a base station control method in a communication system including a base station and a plurality of mobile stations, wherein the base station and each mobile station can communicate with each other by a communication medium of a specific person wireless communication and a wireless public network ,
Receiving at least data relating to current location information from each mobile station;
Designating a communication medium to be used by each mobile station as a designated communication medium from a wireless communication for a specific person and a wireless public line network based on the current location information of each mobile station;
Transmitting a communication medium control command to each mobile station so that the communication port for data transmission in the modem of each mobile station is on the designated communication medium side;
A base station control method characterized by comprising: In a mobile station control method in a communication system, including a base station and a plurality of mobile stations, wherein the base station and each mobile station can communicate with each other by a communication medium of a specific person wireless communication and a wireless public network ,
Receiving a communication medium control command from the base station;
As a communication port that can be used for data transmission, for a modem equipped with each communication port on the specific person wireless communication side and wireless public network side, the data transmission communication port is used as a communication medium control command from the base station. Controlling based on,
Transmitting at least data relating to current location information to the base station via a data transmission communication port;
A mobile station control method characterized by comprising:

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